摘要
调理剂是污泥堆肥发酵过程中的重要辅料,合理的添加配比不但可以有效改善堆体结构,而且可以降低成本,保证堆肥经济高效进行。本文选用锯末作为堆肥调理剂,研究了不同锯末添加量对污泥堆肥过程中温度和氧气变化的影响。结果表明:调理剂添加量对污泥好氧发酵过程温度、氧气和脱水效果均有显著影响。与3∶1(m/m)和5∶1(m/m)的处理相比,污泥和锯末采用3.5∶1(m/m)或4∶1(m/m)的比例可以进一步提高堆体升温速率,缩短达到高温好氧发酵所需温度的时间,延长堆体维持高温的天数。每个鼓风周期内最低含氧量随着堆肥的进行而逐渐增加,耗氧速率则随着堆肥的进行而降低,其中污泥和锯末采用3.5∶1(m/m)或4∶1(m/m)的比例时,耗氧速率较高,微生物活性较大。堆肥物料含水率随着堆肥的进行逐渐降低,且采用3.5∶1(m/m)或4∶1(m/m)比例的脱水干化效果要优于3∶1(m/m)和5∶1(m/m)的处理。考虑到锯末添加量对生产成本的影响,建议污泥和锯末堆肥过程中采用4∶1(m/m)的比例。
Bulking agent is important in the process of sewage sludge composting. A reasonable proportion of bulking agent added in the pile could improve the structure, and reduce costs of composting process. Sawdust was used as compost bulking agent in the present study to explore the influence of different sawdust addition ratios on the temperature and oxygen change during the process of sludge composting. The results showed that the amount of sawdust had a significant impact on temperature, oxygen and dehydration. Compared to the treatment with ratios of 3： 1 （m/m） and 5：1 （m/m）, the treatment with ratios of 3.5：1 （m/m） and 4：1 （m/m） in sludge and sawdust showed higher heating rate, higher temperature, and longer thermophilic phase. The oxygen content at the end of blast and the minimum oxygen content before blast increased along with the compost process, and the oxygen consumption rate decreased. The oxygen consumption rate was higher when the ratios were 3.5：1 （m/m） and 4：1 （m/m） , and microbial activity was greater. The moisture content in compost material decreased with composting, and water removal was larger when the ratio was 3.5：1 （m/m） or4：1 （m/m） than that of3：1 （m/m） and 5：1 （m/m）. Taking the cost into account, the 4：1 （m/m） ratio of sludge to sawdust was suggested for the sludge composting.
出处
《浙江农业学报》
CSCD
北大核心
2015年第4期631-635,共5页
Acta Agriculturae Zhejiangensis
基金
国家水体污染控制与治理科技重大专项子课题(2012ZX07204-001)
河南省重大公益招标项目(101100910300)
河南省科技攻关项目(142102310063)
河南省教育厅科学技术研究重点项目(14A610009)
郑州轻工业学院博士科研基金资助项目(2013BSJJ022)
关键词
城市污泥
堆肥
调理剂
温度
氧气
sewage sludge
composting
bulking agent
temperature
oxygen
